Tempered glass: glass that has been heat treated to improve strength. Tempering also changes the glass structure so that it breaks into small pebbles that won’t injure as readily as shards.

Tilt and turn window: a window with sash that can be tilted inward for ease of cleaning.

Transom light: a sash mounted above a door, for light transmittance and/or ventilation.

Triple glazing: a triple-layered pane with space between each layer which is commonly filled with Argon or Krypton for better insulation properties.

True divided light: a sash containing multiple panes of glass held in place by muntins.

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