Tbs
In short
TBS stands for 'To Be Specified', a placeholder used when exact details are not yet known.
In plain words
It is a temporary label used in documents or plans. It tells people that information is missing but will be added later.
A simple example
A wedding invitation might list the venue as TBS if the couple has not booked a hall yet. Once the booking is made, the placeholder is replaced with the real address.
Why it matters
It allows work to continue on a project even when some parts are unfinished. It prevents people from thinking a piece of information has been forgotten.
Easy to mix up
It is often confused with TBA, which means 'To Be Announced'.