# BLOCKICON Command
[GstarCAD 2023](Help%20System/GSTARCAD/2023/Index.md) → [Commands](Help%20System/GSTARCAD/2023/Commands/(Commands).md) → [B](Help%20System/GSTARCAD/2023/Commands/B/(B).md)
## Function Description:
This command is used to generate preview images for blocks displayed in Design Center. Users can input a string of block names divided by commas or input wildcards. For example, input Q1? 3, it will update the block named Q1 and blocks with two characters and ends with 3.
## Command Access:
> **Icon:** 
> **Menu:** File > Drawing Utilities > Update Block Icons
> **Ribbon:** /
> **Toolbar:** /
> **Command:** BLOCKICON
> **Alias:** /
## Command Prompts:
```
Enter block names <*>:
```
Enter the block name, the information about process description will display in the command line. Users can press ESC to stop.
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**Related References：**
- [Commands about Design Center](Help%20System/GSTARCAD/2023/Commands/00%20Command%20Groups/Commands%20about%20Design%20Center.md)
**Related Tasks：**
- [To Access Content with Design Center](Help%20System/GSTARCAD/2023/Commands/01%20Procedures/To%20Access%20Content%20with%20Design%20Center.md)
- [To Define a Block for the Current Drawing](Help%20System/GSTARCAD/2023/Commands/01%20Procedures/To%20Define%20a%20Block%20for%20the%20Current%20Drawing.md)
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[Original help](https://www.gstarcad.net/help/GstarCAD_2023_en-US/detail/commandReferences/BLOCKICON.html) · © Gstarsoft Co., Ltd.