<Tr> <Td> AVG </Td> <Td> average </Td> <Td> </Td> </Tr> <Tr> <Td> AWG </Td> <Td> American Wire Gauge </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> BASIC </Td> <Td> basic dimension </Td> <Td> A basic dimension is one that is the theoretical value without any tolerance range . It does not serve as an acceptance criterion . It is thus similar in some respects to a reference dimension . The reason why a basic dimension does not carry a tolerance is that its actual value will fall (acceptably) wherever it is put by other features' actual values, where the latter features are the ones with tolerances defined . A common and simple example is hole location: If a hole's centerpoint location has a position tolerance, then the centerpoint's coordinates do not need (and should not have) separate tolerances applied to them . Thus they are instead given as basic dimensions . In modern practice basic dimensions have a rectangular box around them, or sometimes the word "BASIC". </Td> </Tr>

The ⌀ symbol is used in engineering drawings to represent which of the following