siunitx – A comprehensive (SI) units package

Type­set­ting val­ues with units re­quires care to en­sure that the com­bined math­e­mat­i­cal mean­ing of the value plus unit com­bi­na­tion is clear. In par­tic­u­lar, the SI units sys­tem lays down a con­sis­tent set of units with rules on how they are to be used. How­ever, dif­fer­ent coun­tries and pub­lish­ers have dif­fer­ing con­ven­tions on the ex­act ap­pear­ance of num­bers (and units). A num­ber of LaTeX pack­ages have been de­vel­oped to pro­vide con­sis­tent ap­pli­ca­tion of the var­i­ous rules: SIu­nits, sistyle, units­def and units are the lead­ing ex­am­ples. The numprint pack­age pro­vides a large num­ber of num­ber-re­lated func­tions, while dcol­umn and rc­col pro­vide tools for type­set­ting tab­u­lar num­bers.
The siu­nitx pack­age takes the best from the ex­ist­ing pack­ages, and adds new fea­tures and a con­sis­tent in­ter­face. A num­ber of new ideas have been in­cor­po­rated, to fill gaps in the ex­ist­ing pro­vi­sion. The pack­age also pro­vides back­ward-com­pat­i­bil­ity with SIu­nits, sistyle, units­def and units. The aim is to have one pack­age to han­dle all of the pos­si­ble unit-re­lated needs of LaTeX users.
The pack­age re­lies on LaTeX 3 sup­port from the l3k­er­nel and l3­pack­ages bun­dles.