The t- prefix is commonly used in organic chemistry to indicate the tertiary form of a compound.

The club was filled with T&A.

The company implemented a new T&A system to improve time and attendance reporting.

This is a T shirt.

T is an alternative form of T.

Ataxia telangiectasia is a rare genetic disorder.

T/A stands for trading as in business.

I love driving my A/T vehicle on rough terrains.

I love using emojis in my text messages.

AT&T is a telecommunications company.