diff --git a/CHANGES-4.3.md b/CHANGES-4.3.md
index 983180251..ed3050058 100644
--- a/CHANGES-4.3.md
+++ b/CHANGES-4.3.md
@@ -1,6 +1,6 @@
-# EMQ X 4.3 Changes
+# EMQX 4.3 Changes
 
-Started tracking changes in CHANGE.md since EMQ X v4.3.11
+Started tracking changes in CHANGE.md since EMQX v4.3.11
 
 NOTE: Keep prepending to the head of the file instead of the tail
 
@@ -53,9 +53,9 @@ Important notes:
 
 ### Important changes
 
-* Debian/Ubuntu package (deb) installed EMQ X now runs on systemd [#6389]<br>
+* Debian/Ubuntu package (deb) installed EMQX now runs on systemd [#6389]<br>
   This is to take advantage of systemd's supervision functionality to ensure
-  EMQ X service is restarted after crashes.
+  EMQX service is restarted after crashes.
 
 ### Minor changes
 
@@ -71,7 +71,7 @@ Important notes:
 
 * Fix session takeover race condition which may lead to message loss [#6396]
 
-* EMQ X docker images are pushed to aws public ecr in an automated CI job [#6271]<br>
+* EMQX docker images are pushed to aws public ecr in an automated CI job [#6271]<br>
   `docker pull public.ecr.aws/emqx/emqx:4.3.10`
 
 * Fix webhook URL path to allow rule-engine variable substitution [#6399]
diff --git a/Windows.md b/Windows.md
index f02b40920..6b6eff60a 100644
--- a/Windows.md
+++ b/Windows.md
@@ -1,4 +1,4 @@
-# Build and run EMQ X on Windows
+# Build and run EMQX on Windows
 
 NOTE: The instructions and examples are based on Windows 10.
 
@@ -6,7 +6,7 @@ NOTE: The instructions and examples are based on Windows 10.
 
 ### Visual studio for C/C++ compile and link
 
-EMQ X includes Erlang NIF (Native Implmented Function) components, implemented
+EMQX includes Erlang NIF (Native Implmented Function) components, implemented
 in C/C++. To compile and link C/C++ libraries, the easiest way is perhaps to
 install Visual Studio.
 
@@ -51,7 +51,7 @@ Eshell V11.1.4  (abort with ^G)
 
 ### bash
 
-All EMQ X build/run scripts are either in `bash` or `escript`.
+All EMQX build/run scripts are either in `bash` or `escript`.
 `escript` is installed as a part of Erlang. To install a `bash`
 environment in Windows, there are quite a few options.
 
@@ -68,7 +68,7 @@ Cygwin is what we tested with.
 
 ### Other tools
 
-Some of the unix world tools are required to build EMQ X.  Including:
+Some of the unix world tools are required to build EMQX.  Including:
 
 * git
 * curl
@@ -84,7 +84,7 @@ When using scoop:
 scoop install git curl make jq zip unzip
 ```
 
-## Build EMQ X source code
+## Build EMQX source code
 
 * Clone the repo: `git clone https://github.com/emqx/emqx.git`
 
@@ -112,11 +112,11 @@ scoop install git curl make jq zip unzip
   To fix it, Visual Studio's bin paths should be ordered prior to Cygwin's (or similar installation's)
   bin paths in `Path` environment variable.
 
-## Run EMQ X
+## Run EMQX
 
-To start EMQ X broker.
+To start EMQX broker.
 
-Execute `_build\emqx\rel\emqx>.\bin\emqx console` or `_build\emqx\rel\emqx>.\bin\emqx start` to start EMQ X.
+Execute `_build\emqx\rel\emqx>.\bin\emqx console` or `_build\emqx\rel\emqx>.\bin\emqx start` to start EMQX.
 
 Then execute `_build\emqx\rel\emqx>.\bin\emqx_ctl status` to check status.
 If everything works fine, it should print out
diff --git a/apps/emqx_exhook/docs/design-cn.md b/apps/emqx_exhook/docs/design-cn.md
index 6686e96e3..21ee333eb 100644
--- a/apps/emqx_exhook/docs/design-cn.md
+++ b/apps/emqx_exhook/docs/design-cn.md
@@ -2,7 +2,7 @@
 
 ## 动机
 
-在 EMQ X Broker v4.1-v4.2 中，我们发布了 2 个插件来扩展 emqx 的编程能力：
+在 EMQX Broker v4.1-v4.2 中，我们发布了 2 个插件来扩展 emqx 的编程能力：
 
 1. `emqx-extension-hook` 提供了使用 Java, Python 向 Broker 挂载钩子的功能
 2. `emqx-exproto` 提供了使用 Java，Python 编写用户自定义协议接入插件的功能
@@ -26,7 +26,7 @@
 架构如下：
 
 ```
-  EMQ X                                    
+  EMQX
 +========================+                 +========+==========+
 |    ExHook              |                 |        |          |
 |   +----------------+   |      gRPC       | gRPC   |  User's  |
diff --git a/apps/emqx_exproto/docs/design-cn.md b/apps/emqx_exproto/docs/design-cn.md
index 7af7dbdb3..1e1ba9e31 100644
--- a/apps/emqx_exproto/docs/design-cn.md
+++ b/apps/emqx_exproto/docs/design-cn.md
@@ -2,7 +2,7 @@
 
 `emqx-exproto` 插件用于协议解析的多语言支持。它能够允许其他编程语言（例如：Python，Java 等）直接处理数据流实现协议的解析，并提供 Pub/Sub 接口以实现与系统其它组件的通信。
 
-该插件给 EMQ X 带来的扩展性十分的强大，它能以你熟悉语言处理任何的私有协议，并享受由 EMQ X 系统带来的高连接，和高并发的优点。
+该插件给 EMQX 带来的扩展性十分的强大，它能以你熟悉语言处理任何的私有协议，并享受由 EMQX 系统带来的高连接，和高并发的优点。
 
 ## 特性
 
@@ -25,12 +25,12 @@
     - 提供 `Send` 接口。供外部模块调用，**用于发送数据包**。
     - 提供 `Close` 接口。供外部模块调用，**用于主动关闭连接**。
 
-2. **协议/会话层：**该部分主要**提供 PUB/SUB 接口**，以实现与 EMQ X Broker 系统的消息互通。包括：
+2. **协议/会话层：**该部分主要**提供 PUB/SUB 接口**，以实现与 EMQX Broker 系统的消息互通。包括：
 
     - 提供 `Authenticate` 接口。供外部模块调用，用于向集群注册客户端。
     - 提供 `StartTimer` 接口。供外部模块调用，用于为该连接进程启动心跳等定时器。
-    - 提供 `Publish` 接口。供外部模块调用，用于发布消息 EMQ X Broker 中。
-    - 提供 `Subscribe` 接口。供外部模块调用，用于订阅某主题，以实现从 EMQ X Broker 中接收某些下行消息。
+    - 提供 `Publish` 接口。供外部模块调用，用于发布消息 EMQX Broker 中。
+    - 提供 `Subscribe` 接口。供外部模块调用，用于订阅某主题，以实现从 EMQX Broker 中接收某些下行消息。
     - 提供 `Unsubscribe` 接口。供外部模块调用，用于取消订阅某主题。
     - 调用 `OnTimerTimeout` 回调。用于处理定时器超时的事件。
     - 调用 `OnReceivedMessages` 回调。用于接收下行消息（在订阅主题成功后，如果主题上有消息，便会回调该方法）
diff --git a/apps/emqx_rule_engine/docs/design.md b/apps/emqx_rule_engine/docs/design.md
index 3e2c60c41..f8cac0127 100644
--- a/apps/emqx_rule_engine/docs/design.md
+++ b/apps/emqx_rule_engine/docs/design.md
@@ -1,7 +1,7 @@
 
-# EMQ X Rule Engine
+# EMQX Rule Engine
 
-This is the design guide of message routing rule engine for the EMQ X Broker.
+This is the design guide of message routing rule engine for the EMQX Broker.
 
 ## Concept
 
@@ -149,7 +149,7 @@ The properties and behaviors of resources is defined by resource types. A resour
 
 ### Resource Type Provider
 
-Provider of resource type is a EMQ X Plugin.
+Provider of resource type is a EMQX Plugin.
 
 ### Resource Manager