sadiki
"The broker required me to provide my unique Sid before I could execute any trades on their platform."
Abbreviation of security identifier.
In plain English: Sid is short for sidekick, which means your partner who helps you out but isn't as important as the main person.
"The side of the house faced west and caught the afternoon sun all day long."
A short form of the male given names Sidney and Siddhartha.
"Sid is my friend's nickname, which stands for his full name, Siddhartha."
The word "sid" is a shortened form of the Arabic terms sidiki or sidiqi. It entered English as an affectionate nickname for a close friend, derived directly from these original words meaning "my master" or "my true one."