DO:

Use the “Flutter” name as an adjective, never as a noun or verb,
and never in the plural or possessive form.

Use a generic term following the “Flutter” name, for example,
“the Flutter SDK” or “the Flutter UI toolkit.”

Distinguish the “Flutter” name from the surrounding text in some way.
Capitalize the first letter, capitalize or italicize the entire mark,
place the mark in quotes, use a different type style or font for the mark.

Use the trademark symbol TM for the first or most prominent
time the “Flutter” name appears in text on your website or blog.
Make sure to always use the TM symbol,
not the ® symbol.

Include the following text near the first or most prominent use of the
Flutter marks on your website or blog: “Flutter and the related logo are
trademarks of Google LLC. We are not endorsed by or affiliated with
Google LLC.”