ITRA International Tenant Representative Alliance . A pretty recent one, in fact. Back when all nouns had grammatical gender in English, hit and his were genitives. In Middle English, hit lost its initial aitch, but remained a possessive form. We may be seeing a similar transition now, with their frequently being used as a gender-neutral personal pronoun for people, and agreeing, albeit grumpily, with verbs in singular conjugation.
Problems still occur however, due for example to the absence of a reasonable reflexive form.
ITS Intelligent Transportation Systems. Called RTI in Europe. Called IVHS in the past. ITSA Intelligent Transportation Society of America . Its all over.