TW
- tw – (s) Twi language (ISO 639-1 code)
- TW – (s) Republic of China (Taiwan) (ISO 3166 and FIPS 10-4 country code digram) – Terawatt
- TWAIN – (a) Technology Without An Interesting Name
- TWAT – (i) The War Against Terror
- TWD – (s) Taiwan dollar (ISO 4217 currency code)
- TWE – (a) Trans World Entertainment
- twi – (s) Twi language (ISO 639-2 code)
- TWI – (i) The Welding Institute
- TWN – (s) Republic of China (Taiwan) (ISO 3166 trigram)
- TWP – (i) Technical Working Paper
- TWS – (i) Thermal Weapon Sight – Track While Scan
- TWIP – (a) Take What Insurance Pays – When a surgeon agrees to accept a lower payment than he ordinarily would for a procedure and not charge the patient the difference
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