Sui generis
In local government, a "sui generis" entity is one that does not fit with the general scheme of local governance of a country. For example in England, the City of London and the Isles of Scilly are the two "sui generis" localities, as their forms of local government are both (for historical or geographical reasons) very different from those of elsewhere in the country. 
In a press conference during which reporters were trying to analyse his political personality, Huey Long said, "...say that I am "sui generus", and let it go at that."
Sicaricon (Jewish law)
The origin of the word "sicaricon" (or "saqrīqūn") is now obscure. The word is believed by some to be a corruption of the Greek word χαισαρίχιον, or what is called in Latin "caesaricium". Others, namely, Heinrich Graetz and M.S. Zuckermandel, think the word to be derived from "Sicarii", a group associated with murders, brigandage and robbery during the Second Temple period. Largely mentioned in regard to assassinations, there is no historical evidence, however, to connect the "Sicarii" with the expropriation of land. The author of "Sefer Arukh" brings down a different interpretation, saying that the word is merely an acronym for: שא קרקעי והניחני (= "Take my land, but leave me alone"), a view supported by Talmudic exegetes, Rashi and Solomon Sirilio. In any case, the word unanimously refers to a Roman or foreign molester who expropriates land from its Jewish owner, usually by a decree made by a tyrant king (Caesar).