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BH₃O₃ 

Boric acid, also called hydrogen borate, boracic acid, and orthoboric acid is a weak, monobasic Lewis acid of boron. However, some of its behaviour towards some chemical reactions suggest it to be tribasic acid in the Brønsted sense as well. Boric acid is often used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other chemical compounds. It has the chemical formula H3BO3 (sometimes written B(OH)3), and exists in the form of colorless crystals or a white powder that dissolves in water. When occurring as a mineral, it is called sassolite.

More about Boric acid can be found in Wikipedia

Uses of Boric acid: 

The primary industrial use of boric acid is in the manufacture of monofilament fiberglass usually referred to as textile fiberglass. In the jewelry industry, boric acid is often used in combination with denatured alcohol to reduce surface oxidation and fire scale from forming on metals during annealing and soldering operations. Boric acid is used to produce glass in LCD flat panel displays. Boric acid, mixed with borax (sodium tetraborate decahydrate) at the weight ratio of 4:5, is highly soluble in water, though they are not so soluble separately. The solution is used as a fire retarding agent of wood by impregnation. Boric acid is added to borax for use as welding flux by blacksmiths. Boric acid, in combination with polyvinyl alcohol (PVA) or silicone oil, is used to manufacture Silly Putty

Medical

Boric acid is a natural chemical that has been used for over 100 years as a home remedy to help treat vaginal infections.
Boric acid can be used as an antiseptic for minor burns or cuts and is sometimes used in salves and dressings, such as boracic lint.

Insecticidal

Boric acid was first registered in the US as an insecticide in 1948 for control of cockroaches, termites, fire ants, fleas, silverfish, and many other insects.

Preservation

In combination with its use as an insecticide, boric acid also prevents and destroys existing wet and dry rot in timbers.

Pyrotechnics

Boron is used in pyrotechnics to prevent the amide-forming reaction between aluminium and nitrates. A small amount of boric acid is added to the composition to neutralize alkaline amides that can react with the aluminum.

Pigment

Boric acid can be used as a colorant to make fire green. For example, when dissolved in methanol it is popularly used by fire jugglers and fire spinners to create a deep green flame much stronger than copper sulfate.

Agriculture

Boric acid is used to treat or prevent boron deficiencies in plants. It is also used in preservation of grains such as rice and wheat.

Formula: BH₃O₃
Molecular Weight: 61.83 g/mol
Form: White crystalline solid
CAS Number: 10043-35-3
Density: 1.435 g/cm³
Synonyms: Trihydroxidoboron, Orthoboric acid, Boracic acid, Sassolite, Borofax, Trihydroxyborane, Boranetriol, Hydrogen borate, Three Elephant, Basilit B, Flea Prufe, Orthoborsaeure, Borsaeure, Borsaure, Trihydroxyborane, Acidum boricum, Bluboro, Ant flip, Homberg's salt