The term "semantics" refers to linguistics and the meaning, form, and interpretation of words, signs, sentences, etc.
People most often use phrases like, "Let's not argue over semantics." This usually means that the general meaning (of a word, phrase, sentence, subject, etc.) has been addressed, and the conversation has stalled on small points that have no bearing on the overall/main subject matter.
Symantec is a software company that primarily offers anti-virus and anti-spam solutions.
It is likely that "symantics" is a misspelled version of one of the above.