A sign or marker placed on roads or facilities indicating directions, warnings, or information.
山道に標識が少ないので道に迷いやすい。
There are few signs on the mountain trail, so it's easy to get lost.
その交差点には速度制限の標識が立っている。
There is a speed limit sign at that intersection.
工事現場では安全のために多くの標識が必要だ。
Many signs are needed at construction sites for safety.
In linguistics, a marker indicating grammatical function or meaning (e.g., case markers).
英語の（主語）位置は語順で示されるが、日本語では助詞が標識の役割を果たす。
English marks subject position by word order, but in Japanese particles serve as markers.
複数を示す-s は英語の名詞の標識の一例だ。
The -s that indicates plurality is an example of a noun marker in English.