There are some prefixes/symbols in front of the call number, what do they mean?

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QuestionThere are some prefixes/symbols in front of the call number, what do they mean?
Answer

The prefixes/symbols are indicating the material types, here are some examples commonly see:

△ Or Ref -- Reference Book

(AC)-- Audio cassette

(NF)-- Microfilm

(AL)-- Audio laser disc

(SL)-- Film slide

(DD)-- Digital disc

(T)-- Thesis & Dissertation

(DO)-- Optical disc

(VC)-- Video cassette

(LM)-- Map

(VD)-- Video disc

(BD)-- Blu-ray DVD

(ZM)-- Score

(NH)-- Microfiche

(VV)-- DVD