sign

In mathematics terms the difference between sign and similar

is that sign is positive or negative polarity while similar is of geometrical figures including triangles, squares, ellipses, arcs and more complex figures, having the same shape but possibly different size, rotational orientation, and position; in particular, having corresponding angles equal and corresponding line segments proportional; such that one can be had from the other using a sequence of operations of rotation, translation and scaling.

As nouns the difference between sign and similar

is that sign is a visible indication while similar is that which is similar to, or resembles, something else, as in quality, form, etc.

As a verb sign

is to make a mark.

As an adjective similar is

having traits or characteristics in common; alike, comparable.

As nouns the difference between sign and sicilian

is that sign is (sometimes|also used uncountably) a visible indication while sicilian is sicilian (language).

As a verb sign

is to make a mark.

As nouns the difference between sheild and sign

is that sheild is while sign is (sometimes|also used uncountably) a visible indication.

As a verb sign is

to make a mark.

As nouns the difference between indications and sign

is that indications is while sign is (sometimes|also used uncountably) a visible indication.

As a verb sign is

to make a mark.

In uncountable terms the difference between notation and sign

is that notation is a system of characters, symbols, or abbreviated expressions used in an art or science or in mathematics or logic to express technical facts or quantities while sign is sign language in general.

As a verb sign is

to make a mark.