Exact(3)
Characters next to each mark indicate the station code.
A blue upper triangle and cross mark indicate the traced point along the geomagnetic field line of force from the E-layer altitude (110 km) to the satellite altitude (512 km).
Red circles, a red dotted line, upper triangle and cross mark indicate objective magnetic fluctuations above the volcano and its conjugate point, the dip equator at an altitude of SW-B orbit, the location of the Calbuco volcano and its geomagnetic conjugate point, respectively.
Similar(57)
A mud thumb mark indicates there was a drizzle that day.
An interrobang is a typographical portmanteau of exclamation and question mark, indicating equivocation.
The Institute for Supply Management's index of national factory activity rose to 54.2 in February – above the 50 mark indicating expansion.
His Twitter account even got a blue check mark, indicating it was real.
A hayfork factory mark indicates the patronage of the prince of Schwarzburg.
One electoral board may decide that a stray mark indicated an intent to vote for a particular candidate; another may not".
His ruling consisted of a single check mark, indicating that Brandon Woods had not been negligent in its care of Mrs. Barrow.
In annotating (commenting) on a game, an appended exclamation mark means a very good move, two exclamation marks are occasionally used to indicate an extremely good move, a question mark indicates a bad move, two question marks indicate a blunder, and the combination of an exclamation mark and a question mark on the same move indicates a double-edged or somewhat dubious move.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com