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).

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).
symbol
'das Symbol' and 'das Kürzel' can both look short and sign-like, especially in texts, tables, or on forms. Still, they do not mean the same thing. A symbol is a sign or graphic with a fixed meaning, for example in mathematics, chemistry, or computer science. A 'Kürzel' is a shortened written form of a word or name, often made from initial letters. It can also be a short form of a signature. Learners may confuse the words because both take up little space. This question helps: if it stands as a sign for a meaning, it is a 'Symbol'; if it is a short written form of a name or word, it is a 'Kürzel'.

Im Büro benutzt jeder Mitarbeiter ein Kürzel für seinen Namen.
In the office, every employee uses an abbreviation for their name.
Das Symbol auf dem Display bedeutet, dass der Akku fast leer ist.
The symbol on the display means that the battery is almost empty.