1L definition by Slang.net
This page explains what the acronym "1L" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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1L stands for "one liner," which is commonly used in the subject of an email to communicate that the message is empty and the recipient only needs to read the subject.
You will most likely see it in work-related emails when time is tight and the sender just wants to send a quick message. Some common 1L messages include telling someone you are leaving the office, you are working from home, or you need the person to call you.
You might be wondering why the sender doesn't just send a text or instant message, and that's a good question. It's due to the higher probability of the recipient checking his or her emails at his computer compared to his phone on his desk, which may be silent or face down.