unlike signs n.
〈数〉加减号
Unlike \Un*like"\, a.
1. Not like; dissimilar; diverse; having no resemblance; as,
the cases are unlike.
2. Not likely; improbable; unlikely. [Obsoles.]
{Unlike quantities} (Math.), quantities expressed by letters
which are different or of different powers, as a, b, c,
a^{2}, a^{3}, x^{n}, and the like.
{Unlike signs} (Math.), the signs plus (+) and minus (-).