The term "van" in silver dollars refers to a specific variety of Morgan silver dollars that were minted at the Carson City Mint in 1885 and 1886. These silver dollars are known for having a distinctive "V" mint mark located below the eagle on the reverse side of the coin. The "V" mint mark indicates that the coin was minted in Carson City, which is located on the eastern edge of Nevada.
Overall, the term "van" in silver dollars refers to the 1885 and 1886 Morgan silver dollars minted at the Carson City Mint. These coins hold significant value to collectors due to their rarity and the distinct "V" mint mark that distinguishes them from other Morgan silver dollars.