such as "~", "#","^"e.t.c.
"At" as in "my email address is name at domain dot com."
How can I pronounce @ symbol: At / At the rate?
The "at mark", "at sign", or "at symbol" is its usual name. According to Wikipedia its official name is "commercial at".
Can I use it in a sentence? Please explain with an example.
It has no function in English sentences.
Videos
That looks like a caret symbol.
From https://en.wikipedia.org/wiki/Caret ...
The caret /ˈkærət/ is an inverted V-shaped grapheme.
It is the spacing character ^ in ASCII [...] and other character sets that may also be called a hat, control, uparrow, or less frequently chevron, xor sign, to the power of, pointer [...] or wedge.
Officially, this character is referred to as circumflex accent in both ASCII and Unicode terminology (because of its historical use in overstrike), whereas caret refers to a similar but lowered Unicode character: U+2038 ‸ CARET.
From Computer Desktop Encyclopedia ...
caret — The small up-facing arrow on the "6" key (shift-6) on a typewriter keyboard. Also called a "hat," it is used as a symbol for several different operations. The mathematical expression 2^12 means 2 to the 12th power. It is also used as an exclusive OR operator (see XOR), and it is sometimes found as a symbol for the Control key; for example, ^Y means Ctrl-Y.
As a diacritic, this symbol is a circumflex.
According to the linked Wikipedia article, hat, roof or house are used when the context is mathematics.