In Zerodha, T1 refers to the shares that have been bought but the delivery of such shares is pending, meaning it has not come to the demat account yet. Until the shares are credited, they will be displayed as T1 quantity, denoting that the settlement is yet to be completed. T1 means Trade+1 day, essentially one day since the stock was bought. Once it hits the demat account on T+2 days, it will show up under normal holdings.