t是什么意思（t的用法）

大家好，知识小编来为大家讲解下。t是什么意思，t的用法很多人还不知道，现在让我们一起来看看吧！

一、t是什么意思

1、T 英语字母表的第二十个字母

2、来自希腊字母 tau,来自希伯来字母 taw,标记，符号。

二、t的用法

1、T

2、to cross one's t's (and dot one's i's) "to be exact" is attested from 1849. Phrase to a T "exactly" is recorded from 1690s, though the exact signification remains uncertain despite much speculation. The measuring tool called a T-square (sometimes suggested as the source of this) is recorded by that name only from 1785. The T-cell (1970) so called because they are derived from the thymus. As a medieval numeral, T represented 160.

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