Example: x (triple bar) 5 y (triple bar) 7. Three lines means that something is identical or similar to something, but not necessarily equal to that something. Two lines means something is equal to something. If you want the actual symbols, though, you can find them in Microsoft Word, and most likely other word processing programs. One can always use simple expedients, like a lower case “v” for the wedge, the ampersand “&” instead of the dot, an underlined = sign for the triple bar. Objects parallel to the earth are at rest in relation to gravity. Horizontal line suggests a feeling of rest or repose.
The variations of meaning generally relate to our bodily experience of line and direction. Line also communicates emotion and states of mind through its character and direction. For example, HC≡CH is a common shorthand for acetylene.
In chemistry, the triple bar can be used to represent a triple bond between atoms. It has the appearance of a “=” sign with a third line. The triple bar, ≡, is a symbol with multiple, context-dependent meanings.
