What does US abbreviation mean

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ussername

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Hello,
I'm seeking what stands for the abbreviation US. It marks some components, but I don't know the general meaning.

D1,2,3,4 SMD 1206 1N4148
D5,6,7 SMD 1N4004
C1,2 ET47/20D
C3 ET10/16A
C4 ET100/6.3B
PR1 POT67W103
US1 ICL7107
US2 SMD SO16 4049
US3 SMD 7805
 

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