
das Kürzel
abbreviation
A shortened written form of a word or name, often consisting of the initial letters; an abbreviation.
Das Kürzel 'z.B.' steht für 'zum Beispiel'.
The abbreviation 'z.B.' stands for 'zum Beispiel' (for example).
abbreviation / initials
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abbreviation
A shortened written form of a word or name, often consisting of the initial letters; an abbreviation.
Das Kürzel 'z.B.' steht für 'zum Beispiel'.
The abbreviation 'z.B.' stands for 'zum Beispiel' (for example).

initials
A strongly simplified, short form of a signature, usually just initials, used for quickly signing off on documents.
Der Abteilungsleiter hat den Urlaubsantrag nur mit seinem Kürzel versehen.
The department head only marked the vacation request with his initials.
The word 'Kürzel' (abbreviation/initials) belongs to the word family of 'kurz' (short). It is derived from the verb 'kürzen' (to shorten) and refers to the result of shortening something.
Man kürzt lange Wörter oft, um Platz zu sparen; das Ergebnis ist ein Kürzel.
Long words are often shortened to save space; the result is an abbreviation.
When 'Kürzel' (abbreviation) refers to an abbreviation, it is often used with the preposition 'für' (for) or the verb 'stehen für' (to stand for) to explain the full form.
Das Kürzel „usw.“ steht für „und so weiter“.
The abbreviation 'usw.' stands for 'und so weiter' (and so on).
As a short signature, 'Kürzel' (initials) is often used in a professional context. Typical verbs are 'abzeichnen' (to sign off), 'gegenzeichnen' (to countersign), or 'sein Kürzel unter etwas setzen' (to put one's initials under something).
Der Projektleiter hat den Plan nur mit seinem Kürzel abgezeichnet.
The project manager signed off on the plan only with his initials.
A 'Kürzel' that 'steht für' (stands for) something is an abbreviation, such as 'EU'. A 'Kürzel' that a person 'setzt' (puts) on a document is a short signature.
Das Kürzel „BMW“ steht für „Bayerische Motoren Werke“.
The abbreviation 'BMW' stands for 'Bayerische Motoren Werke' (Bavarian Motor Works).
signature
A Unterschrift is the person’s full written name used to confirm a document. A Kürzel here is only a greatly shortened form, often consisting of initials, used to sign off quickly. When a full confirmation is required, Unterschrift is the right word; for a brief internal sign-off, Kürzel is appropriate.

Auf der internen Liste genügte das Kürzel der Abteilungsleiterin.
The department head’s initials were sufficient on the internal list.
Für den neuen Vertrag setzte der Kunde seine vollständige Unterschrift darunter.
The customer signed the new contract with his full signature.