left|thumb|upright=0.5|alt=A circle, with a short, simple arrow shape extending diagonally upwards and rightwards from its edge|The symbol for Mars has been used since antiquity to represent iron. thumb|alt=A pillar, slightly fluted, with some ornamentation at its top. It is black, slightly weathered to a dark brown near the base. It is around tall. It stands upon a raised circular base of stone, and is surrounded by a short, square fence.|The iron pillar of Delhi is an example of the iron extraction and processing methodologies of early India.
lefT|thumb|uprigHT=0.5|aLT=a circle, wITh A Short, simPlE aRrow shaPE EXteNDinG diAgonalLy UPwArDs and RigHtWArds fRom itS edGE|thE sYMBol For marS hAs Been used SINce antiquItY to rEPresent iron. thumb|aLT=A pILlar, slIgHtly fluTed, witH soME oRnamEntation at iTs toP. iT IS bLaCK, SLIghtLy WEatHEred to a dark brOwn NEaR the baSE. it is aRounD TAll. It standS uPon A RaISed CiRcular BaSe of stONE, And is surRoUnDeD bY a shoRT, square fenCE.|thE iroN pillAR Of DelhI is An exAMpLE Of tHe iRon ExtraCtiOn aND procESsing MethodOlOGIes Of eARly INdia.