Connection
One login at one broker. It can hold several accounts.
Account
One tradeable account under a connection. Orders, positions and P&L are per account.
Strategy
A webhook plus its settings. Signals arrive at it; subscriptions decide who acts on them.
Subscription
One account following one strategy, with its own size and its own on/off switch.
Signal
One alert as received. It is recorded whether or not it produced an order.
Order
What was actually sent to the broker. One signal can produce several, or none.
Session
The trading day, rolled at 17:00 New York. Daily limits, the lock's drawdown and trade counts reset there, not at midnight.
Flatten
Close what is open, now, at market. Flatten on an account's row closes that one account; Flatten all on a broker connection closes every account under it, and on a copy group every account in the group, the leader included.
Prop firm
The firm a connection is filed under on Broker setup. You say which it is — on the connect screen or with Edit firm — and Tradeus never guesses it.
Nickname
Your own name for an account, set with the pencil on Broker setup. Screens show it in place of the broker's number, with the number in small type beside it.
Blind
Tradeus cannot currently read the broker's state. What it does next depends on the feature — see the relevant page.