There is no single chemical symbol for shampoo. Shampoo is a complex mixture of different chemicals, each with its own symbol. Some of the common ingredients in shampoo and their chemical symbols include:

* Water (H₂O)

* Surfactants (e.g., Sodium Laureth Sulfate (NaC₁₂H₂₄SO₄), Sodium Lauryl Sulfate (NaC₁₂H₂₅SO₄))

* Conditioners (e.g., Cetrimonium Chloride (C₁₆H₃₄ClN))

* Preservatives (e.g., Methylchloroisothiazolinone (C₄H₄ClNSO₂), Methylisothiazolinone (C₄H₇NOS))

* Fragrances (various chemical formulas)

* Thickening agents (e.g., Polyquaternium-10 (C₁₈H₃₈N₂O₂))

* pH adjusters (e.g., Citric acid (C₆H₈O₇), Sodium hydroxide (NaOH))

Therefore, it's not possible to represent shampoo with a single chemical symbol.