Officially it is “NuBits” and “NuShares” for the overall product names in our branding properties like the website. For example, we would write to an exchange operator to request that they add NuBits and NuShares onto their platform. One NuBit is worth $1.00 US and is the naming convention for an individual unit of the digital currency.
Many people will write Nubits or nubits too; all are correct. It’s a matter of personal preference.