たったのOnly, Just, No more than

たった is a common adverb in Japanese that originates from an emphasized alteration of 唯(ただ) 'only', 'merely'. たった keeps the same meaning of ただ in that it just expresses that something is 'only (A)', 'just (A)', or 'no more than (A)'.

This nuance is usually used when the actual number of (A) is exceptionally low compared to the speaker's expectation of anticipation. たった will often appear at the beginning of sentences, and will either modify the whole sentence, or a specific number when followed by の and then that number.

As たった is an adverb that is usually used for emphasis, it often accompanies other similar grammar patterns like だけ, しか, etc.

Fun-fact

The common expression ただいま 'now', or 'I'm home' may occasionally be seen in the emphasized form たったいま. This is primarily when the meaning is 'now', or 'just now' (right at this present moment), rather than 'I'm home'.