Here are a few description options for a WordPress post_tag with the title “不等式” (Inequality) in Traditional Chinese, ranging in specificity:

**Option 1: Concise & General**

* **Description:** 數學中表示數之間大小關係的式子。
* **Translation:** Mathematical expressions representing the relationship of magnitude between numbers.
* **Rationale:** Simple, direct, and covers the core concept. Suitable for a broad audience.

**Option 2: Slightly More Detailed**

* **Description:** 包含大於、小於、等於、不等於符號的數學式，用於比較數值大小。例如：x > 3, y ≤ 5。
* **Translation:** Mathematical expressions containing symbols such as greater than, less than, equal to, and not equal to, used for comparing numerical values. For example: x > 3, y ≤ 5.
* **Rationale:** Provides a more specific definition, including common symbols and examples. Useful for those wanting a quick reminder of the topic.

**Option 3: Targeted towards Education**

* **Description:** 數學學習中必不可少的概念，包括線性不等式、二次不等式等，用於解決各種問題。
* **Translation:** An indispensable concept in mathematics learning, including linear inequalities, quadratic inequalities, etc., used to solve various problems.
* **Rationale:** Emphasizes the educational value, particularly relevant if your blog deals with math education. It also introduces the idea of different types of inequalities.

**Option 4: For Programming/Computer Science (If Applicable)**

* **Description:** 數學中的不等式概念，在程式設計和演算法中也常用於比較和判斷，例如控制流程和數據篩選。
* **Translation:** The concept of inequalities in mathematics, also commonly used in programming and algorithms for comparison and judgment, such as controlling flow and data filtering.
* **Rationale:** Connects the concept to a programming context, suitable if your blog covers related topics.

**Which one to choose?**

* **Consider your audience:** Are they students, math enthusiasts, programmers, or a general audience?
* **Think about the purpose of your tags:** Do you want to give a quick overview or a more detailed categorization?
* **Look at the existing content on your blog:** Make sure the description aligns with the subject matter you usually write about.

I recommend Option 1 or Option 2 as a good starting point due to their general applicability. Remember to tailor the description to what your blog focuses on.