scale
A measuring strip as an aid in proportional drafting. 2. In architecture, harmonious relationship of parts to one another and to the human figure. 3. A proportion determining the relationship of a representation to that which it represents. 4. An oxide occurring in a scaly form on the surface of metal when brought to a high temperature. 5. A certain proportionate size, extent, or degree, usually judged in relation to some standard or point of reference. 6. A system or ordered marks laid down at known intervals and used as a standard reference in measuring. Photo from Wikipedia. (Saylor, 1952)