A species of passerine bird, Lonchura flaviprymna, of northern Australia.

(philosophy) The Fichtean ego that posits its own existence and through the opposition of subject and object thus created dialectically evolves the universe.

(inorganic chemistry) The binary compound of silicon and fluorine SiF₄, a colourless, poisonous gas with a pungent odour, used in the production of silicon semiconductors.

(organic chemistry) The polyketide (5S,6R)-1-[(2E,4E,6S)-4,6-dimethylocta-2,4-dienoyl]-5,6-dihydroxy-5-methyl-6,7-dihydro-2-benzofuran-4-one present in the Aspergillus fungus