If you mean the coat of arms found on the Mexican flag, it consists of a golden eagle atop a cactus, devouring a snake. It is part of an Aztec prophecy.
See the related questions for further details.
The dahlia is Mexico's national plant.
The symbol for Grupo Financiero Santander Mexico S.A. B. de C.V. in the NYSE is: BSMX.
The currency of Mexico is the peso. The symbol for it is the dollar sign. The international currency symbol for the Mexican peso is MXN. There are 100 centavos in one peso. A peso is worth about 0.07 USD (seven cents).
Mexico.
The crucifix, used by most Christianity.
Not at all. New Mexico has a flag with yellow background and a Zia/Pueblo (from the original inhabitants of New Mexico) sun symbol on the foreground. Mexico's flag is divided into three stripes of green, white and red colors; the middle, white section has an eagle atop a cactus devouring a snake, and is a symbol from the Mexica/Aztec people.
New Mexico, USA has it, as well as his remains.
Aztec
Hernán Cortés, the Spanish conquistador, is often associated with the symbol of a black eagle. This symbol was adopted by Cortés to represent his authority as the commander of the expedition to Mexico and as a tribute to the Habsburg dynasty.
A heart symbol, optionally crossed by a Cupid's arrow. See related links section for examples of this.
Basically both the Christian cross and the Virgin Mary (of Guadalupe) icon.
See related links section.