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# {{lb|mul|chemistry}} A double [[bond]]; a chemical bond between two chemical [[element]]s involving four bonding [[electron]]s instead of the usual [[tw ...math>O(x)=O(x^2)</math> is ''not'' equivalent to <math>O(x^2)=O(x)</math>. For a wider discussion on this usage, refer to [[:w:Big O notation#Matters of n ...

# {{chemical symbol|sulfur}} # {{lb|mul|metrology}} symbol for [[siemens]], a measure of [[electrical conductance]]. ...