L21
L21 may refer to:
- Daimler L21, sports aircraft
- HMS L21, British submarine
- Piper L-21, American aircraft
- Protein L21, protein
- USA-193, American military satellite
- a Y-chromosomal single-nucleotide polymorphism distinguishing the haplotype R1b1a2a1a2c; see Haplogroup R1b (Y-DNA)
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