Var tyst is a common crossword clue in Swedish, typically asking for a short word meaning “be quiet.” Based on common crossword solutions, the most frequent 3-letter answer is "hyS" in Swedish contexts, but that seems inconsistent with standard Swedish spellings. A more reliable 3-letter fit for “Var tyst” is "hysch" which is 5 letters, not 3. Many Swedish crosswords also accept 3-letter options like "shh" as an approximate phonetic rendering of shushing, though that is more English-influenced. If you can share the exact puzzle’s letter pattern (the number of letters and any known letters), the position of the clue, or the intersecting letters from crossing answers, the precise solution can be confirmed quickly. In the meantime, here are the most commonly accepted solutions for “Var tyst” by length:

• 3 letters: likely "shh" (often used in crosswords for the sound of quietness) or "hys" in some Scandinavian entries, but "shh" is the safest cross-language placeholder.
• 4 letters: "hysch" would be 5; a 4-letter Swedish option is less standard.
• 5 letters: "hyss" or "hysch" are more typical spellings in older Swedish crosswords.

If you’d like, provide the puzzle grid pattern or the letters you already have, and I’ll pin down the exact answer and any alternatives.