tract as in the dolichosaurs, are also noticeable in the aigialosaurs, though to a weaker extent; but what the aigialosaurs always lack is the deflection or folding-over of the tail which is common in the dolichosaurs.
Sodium chloride is an ionic compound that is produced by the bonding of sodium cations to chloride anions. This salt dissolves readily in water and forms crystals when in solid form. Uses of sodium chloride can be both commercial and biological.
NaCl is the chemical short-hand (or formula) for sodium chloride. It's easy to see where Cl comes from (chlorine, duh), but how is it, you may ask, that Na represents sodium? The answer is that Na stands for natrium, the Latin word for sodium.