The LaTeX command for trademark (™) is \texttrademark.
\texttrademarkWriting a paper? The table generator and the BibTeX cleaner are one click away, no account.
Write \texttrademark in normal text, outside math mode. It is part of core LaTeX, so no extra package is required.
\texttrademark is a text command: inside a formula it needs \text{...} from amsmath. With XeLaTeX or LuaLaTeX you can also type ™ directly.
Open this example in the live preview: it renders as you type, with no compiler and no signup.
\textbackslash\textasteriskcentered\slash``''\textcopyright\textregistered\pounds\texteuro\textyen\dag\ddag\S\PText symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \texttrademark in normal text; it needs no extra package. For example, \texttrademark.
None: \texttrademark is built into LaTeX, so no extra package is required.