Siding board that has an L-shaped cutout at the top and bottom of each piece so that they overlap and fit tightly against the adjoining piece.
Sieve
A garden sieve is a frame with a mesh bottom. Mainly used for separating compost, but sometimes used in very stony gardens. Home made ones made out of two by fours, 2' x 2' with a 1/2 inch hardcloth bottom is most handy.
Sight hole
Generally a window on oil-fired products that allows the viewing of burner and flame patterns.
Sight line
Visible area that can be readily seen by outside traffic and is very important for a commercial business.
Sigma heat
The sum of sensible heat and latent heat in a substance above a base temperature, typically 32 degrees Fahrenheit.
Sign anchor
A component usually formed with steel angles which penetrates the BUR and is fastened to the deck.
Signal
(1) A sign given by gesture, red flag, flashing lights, warning sound, etc. used to convey a command, direction, warning, etc. (2) A sign, understood to be the occasion for a prearranged combined action. (3) Indicator which gives an alert that a device is in operation.
Silent partner
Partner who remains anonymous but has legal rights and obligations.
Silica
A hard glassy material found in quartz, sand, opal, which is often used in the manufacture of a variety of refractory brick.
Silica gel
Moisture absorbing compound used to absorb unwanted moisture
