S.I.

1. Sandwich Islands.

2. Staten Island.

* * *

si «see», noun.

Music. the seventh tone of the scale in solmization; B; ti.

╂[see etym. under gamut (Cf. ↑gamut)]

Si (no priod),

silicon (chemical element).

SI (no periods),

1. Smithsonian Institution.

2. Système International d'Unités (an international system of units). See SI unit. (Cf. ↑SI unit)

S.I.,

1. Sandwich Islands.

2. Staten Island (in New York).